FOR_EACH_CHILD(ch, btrn) {
struct btr_buffer_reference *br = para_malloc(sizeof(*br));
br->btrb = btrb;
br->consumed = consumed;
list_add_tail(&br->node, &ch->input_queue);
btrb->refcount++;
FOR_EACH_CHILD(ch, btrn) {
struct btr_buffer_reference *br = para_malloc(sizeof(*br));
br->btrb = btrb;
br->consumed = consumed;
list_add_tail(&br->node, &ch->input_queue);
btrb->refcount++;